The Mystery Class investigation is an eleven-week hunt in which students try to find ten secret "Mystery Classes" hiding around the globe. The changing amount of sunlight at each site is the central clue.

Students take an inspiring journey from knowing only sunrise and sunset times to discovering exact locations of the ten sites. This investigation demonstrates that, as spring sweeps across the Northern Hemisphere, day length changes everywhere on Earth. Students see that these dramatic seasonal changes in sunlight affect the entire web of life.

"You can't bottle the excitement of Mystery Class. You start with nothing more than a sunrise and sunset, and you end up with an exact location. When the students discover where it is, it's as if they are the first explorers there."
Cathie Plaehn, Boyceville Wisconsin

Press Release: Uncover Global Mystery Sites

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